<!DOCTYPE html>
<html>
  <head>
<style>
input {
  display: none;
}

label {
  position: relative;
  padding-left: 25px;
  color: #4fcb37;
}
label:before {
  content: "";
  display: block;
  width: 16px;
  height: 16px;
  position: absolute;
  left: 0;
  top: 0;
  background: #fff;
  border: 2px solid;
  -moz-border-radius: 50%;
  -webkit-border-radius: 50%;
  border-radius: 50%;
/*  -moz-box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.4);
  -webkit-box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.4);
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.4);*/
}
label:after {
  content: "";
  width: 10px;
  height: 10px;
  position: absolute;
  left: 5px;
  top: 5px;
  background: #4fcb37;
  display: none;
  -moz-border-radius: 50%;
  -webkit-border-radius: 50%;
  border-radius: 50%;
/*  -moz-box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.6);
  -webkit-box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.6);
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.6);*/
}

input:checked + label:after {
  display: block;
}
</style>
    
  </head>
  <body>
    <div id="example"></div>
    <input type="radio" name="sex" id="male" value="male" checked />
<label for="male">男</label>
<input type="radio" name="sex" id="female" value="female" /><label for="female">女</label>
    
  </body>
</html>